Characterization of the roles of aggression in a public school of San Juan de Pasto Resumen La agresion escolar es una accion violenta e intencionada que un estudiante tiene contra otro. Los roles frente a la agresion son el agresor u hostigador, la victima y el espectador. La presente investigacion busco caracterizar los roles de la agresion en una institucion publica de San Juan de Pasto. Se realizo un estudio cuantitativo de tipo descriptivo. Se trabajo con 169 estudiantes de 6 a 11 grado escolar. Se construyo un cuestionario teniendo en cuenta preguntas que evaluaron a los tres roles frente a la agresion. El instrumento fue sometido a validacion de contenido a traves de jueces el cual fue evaluado con un promedio de 4,6 sobre 5. La fiabilidad del instrumento se realizo a traves del Alfa de Cronbach la cual fue de 0.931. Los resultados muestran que son mas los espectadores que los estudiantes agresores o victimas, y que son mas los hombres que se caracterizan en los tres roles de la agresion. Palabras claves: Agresion, espectador, agresor, victima. Abstract School bullying is a violent and deliberate action that one student has against another. The roles against aggression are the aggressor or harasser, the victim and the spectator. The present research sought to characterize the roles of aggression in a public institution in San Juan de Pasto. A quantitative descriptive study was carried out. We worked with 169 students in grades 6 through 11. A questionnaire was constructed taking into account questions that evaluated all three roles in the face of aggression. The instrument was subjected to validation of content through judges, which was evaluated, with an average of 4.6 out of 5. The reliability of the instrument was performed through Cronbach's Alpha, which was 0.931. The results show that there are more viewers than student attackers or victims. And that more men are characterized in the three roles of aggression Keywords: Aggression, viewer, aggressor, victim.